CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Accumulated Deficit	Accumulated Deficit Cumulative Effect, Period of Adoption, Adjustment
Beginning balance (in shares) at Jun. 30, 2017			42,797			5,354
Beginning balance at Jun. 30, 2017	$ 261,956	$ 249	$ 43	$ 624,001	$ (32,325)	$ (113,071)	$ (216,692)	$ 249
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture			70			(143)
Issuance of common stock for employee stock purchase plan and upon exercise of stock options	3,509			388		$ 3,121
Vesting of Restricted stock awards (in shares)			1,115
Vesting of Restricted stock awards	0		$ 1	(1)
Stock compensation plan expense	34,200			34,200
Settlement of conversion premium upon maturity of the Notes (in shares)			588
Settlement of conversion premium upon maturity of the Notes	0		$ 1	(1)
Settlement of note hedges (in shares)						595
Settlement of note hedges	0			19,964		$ (19,964)
Warrant settlements (in shares)			264
Warrant settlements	(2)			(2)
Minimum pension liability adjustments, net of tax	1,087				1,087
Net (loss) income	9,328						9,328
Unrealized gain (loss) on available for sale securities, net of tax	(5)				(5)
Change in fair value on interest rate hedging instruments	2,590				2,590
Foreign currency translation adjustment	(1,980)				(1,980)
Ending balance (in shares) at Jun. 30, 2018			44,834			5,806
Ending balance at Jun. 30, 2018	310,932	26,263	$ 45	678,549	(30,633)	$ (129,914)	(207,115)	26,263
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture			45			(126)
Issuance of common stock for employee stock purchase plan and upon exercise of stock options	3,924		$ 1	1,104		$ 2,819
Vesting of Restricted stock awards (in shares)			1,184
Vesting of Restricted stock awards	0
Stock compensation plan expense	41,790			41,790
Warrant settlements (in shares)			932
Warrant settlements	(4)		$ 1	(5)
Minimum pension liability adjustments, net of tax	(4,730)				(4,730)
Net (loss) income	9,432						9,432
Unrealized gain (loss) on available for sale securities, net of tax	14				14
Change in fair value on interest rate hedging instruments	(3,875)				(3,875)
Foreign currency translation adjustment	(4,369)				(4,369)
Ending balance (in shares) at Jun. 30, 2019			46,995			5,680
Ending balance at Jun. 30, 2019	379,377	$ 37	$ 47	721,438	(43,593)	$ (127,095)	(171,420)	$ 37
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture			14			(123)
Issuance of common stock for employee stock purchase plan and upon exercise of stock options	4,134			1,227		$ 2,907
Vesting of Restricted stock awards (in shares)			1,138
Vesting of Restricted stock awards	0		$ 1	(1)
Stock compensation plan expense	42,242			42,242
Repurchase of common stock to be held in treasury (in shares)						418
Repurchase of common stock to be held in treasury	(19,145)					$ (19,145)
Minimum pension liability adjustments, net of tax	943				943
Net (loss) income	(9,229)						(9,229)
Unrealized gain (loss) on available for sale securities, net of tax	29				29
Change in fair value on interest rate hedging instruments	(3,794)				(3,794)
Foreign currency translation adjustment	(2,260)				(2,260)
Ending balance (in shares) at Jun. 30, 2020			48,147			5,975
Ending balance at Jun. 30, 2020	$ 392,334		$ 48	$ 764,906	$ (48,675)	$ (143,333)	$ (180,612)